linux-kernel - Re: [PATCH 0/2] x86/PCI: enable pci=use

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Date:	Wed, 17 Jun 2015 17:28:35 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Cc:	Takashi Iwai <tiwai@...e.de>, "x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, dayer3@...il.com,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 0/2] x86/PCI: enable pci=use_crs for more machines

On Tue, Jun 16, 2015 at 11:55 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> We have a few reports of sound devices not working because the BIOS didn't
> assign space for the device and the PCI core put it at an address that
> doesn't work.
>
> The Foxconn system has two PCI host bridges, and without the information
> from _CRS, the PCI core assigns space under the wrong bridge.
>
> We also have reports from pre-2008 systems (where we normally ignore _CRS)
> that support more than 32 physical address bits.  After d56dbf5bab8c ("PCI:
> Allocate 64-bit BARs above 4G when possible"), we prefer to use that high
> space when we can, but it seems the host bridge doesn't respond to it.
>
> _CRS tells us how to avoid both problems, so these patches enable it for
> these cases.
>
> ---
>
> Bjorn Helgaas (2):
>       x86/PCI: Use host bridge _CRS info on Foxconn K8M890-8237A
>       x86/PCI: Use host bridge _CRS info on systems with >32 bit addressing

I applied both patches to pci/resource for v4.2.
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